@rem:20rem;

 /*清除浮动代码*/
.Tools .clearfloat:after{display:block;clear:both;content:"";visibility:hidden;height:0}
.Tools .clearfloat{zoom:1}

li{
  list-style-type:none;
}
a{
  text-decoration:none;
}
.canvas{
    cursor: crosshair;
}

